Which technique is useful for showing clusters of tree leaves instead of drawing every leaf separately?

Correct answer: Dabbing with a brush

The governing concept is suggesting texture through grouped marks rather than copying every individual object. In dabbing, the brush is touched or pressed repeatedly to make small, varied spots that visually combine into foliage clusters. Thus option B is correct. Long straight lines do not naturally suggest leafy masses, a smooth wash lacks the broken texture of leaves, and cutting the paper is not a brush-painting technique.